Akademik Veri Yönetim Sistemi
Engineering Failure Analysis, cilt.163, 2024 (SCI-Expanded)
Iron-aluminide (Fe-Al) intermetallics are characterized by their high-temperature oxidation resistance. However, their use in tribo-corrosive environments is limited due to their low hardness and brittle nature. To overcome this weakness, the feasibility of forming composite coatings (NbC-FeAl) by intercalation of refractory NbC particles into Fe-Al coatings by thermo-reactive diffusion technique and its effect on high-temperature wear behavior was investigated in this study. The coatings obtained underwent comprehensive characterization using scanning electron microscopy, X-ray diffraction, microhardness measurements, and ball-on-disc wear tests, providing valuable insights into their properties. The characterization studies showed that increasing the growth of NbC in the intermetallic iron-aluminide content resulted in a slight increase in the hardness and a decrease in the thickness of the iron-aluminide layer. Moreover, the formation of NbC in Fe-Al coatings increased the dislocation densities of the coatings, resulting in an improvement of wear resistance 2.7 times at room temperature and up to 3.5 times at 500 °C. While different wear mechanisms occurred in coated samples at room temperature, the dominant wear mechanism at 500 °C evolved into an oxidatively supported adhesive wear mechanism. This study showed that Fe-Al coatings exhibited better wear response at both room and elevated temperatures when reinforced with NbC.